Smart thermometer hygrometer with external probe for higher measurement accuracy. In addition to being widely used in rooms, greenhouses, warehouses, etc., it is more suitable for temperature and humidity detection in freezers, incubators, laboratories, power distribution rooms and machine rooms. High-definition LED digital display can be clearly read in the dark Real-time data update and application: with external waterproof probe to monitor temperature to stable connection and low temperature resistance. Operating temperature range up to: -40F to +257F (-40C to +125C). Updates in real time with no lag, perfect for monitoring refrigerators, freezers, laboratories and plant rooms. Water temperature monitoring is fine. Built-in rechargeable battery: Tuya wireless temperature sensor is powered by DC5V power adapter with USB function. Built-in rechargeable backup battery, when the external power supply is interrupted, the battery can continue to work for 6 hours. The smart temperature sensor with a magnet on the back can be directly attached to the metal surface. LINKS WITH OTHER DEVICES: Set up your smart routines within the app. For example, the air conditioner turns on automatically when the ambient temperature exceeds 82F. As long as the device is compatible with Tuya/Smart Life APP, more smart devices can be synchronized. Plug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the , the Philippines,Taiwan and so on. Voltage:AC100-240V Color: Black & White Material: plastic Package Contents: 1 x Tuya WiFi Temperature Humidity Detector Alarm Sensor 1 x 1m Sensor Probe 1 adapter with USB Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.